Electrical signaling system.



A. GOLDSTEIN & 0. H. POOL.

ELECTRICAL SIGNALING SYSTEM. APPLIOATION FILED HAZE. 9, 1910.

966322. Patented Aug. 9, 1910.

' Zia/"man Er UNITED STATES PATENT OFFICE.

ALBERT GOLDSTEIN AND CLARK H. POOL, OF NEW YORK, N. Y., ASSIG'N'ORS TOINTER- NATIONAL ELEOTEIO PROTECTION COMPANY, A CORPORATION OF NEW YORK.

ELECTRICAL SIGNALING SYSTEM.

.pplication filed March- 9, 1910. Serial No. 548,255.

To all whom it may concern:

Be it known that we, ALBERT GOLDSTEIN and CLARK H. PooL, citizens'of.the United States, residing at New York, in the county of New York andState of New York, have invented a certain new and useful Improvement inElectrical Signaling Systems, of which the following is a specification.

The invention relates to an electrical signaling system constructed sothat an abnormal disturbance of electrical conditions upon the circuitshall remedy itself by causing devices to be automatically actuated torestore the working efliciency of the system.

Theinvention consists in the means whereby after the effect of saiddisturbance has been neutralized and upon the subsequent removal orrepair thereof, the original electrical conditions of the circuit becomeautomatically restored; and second, in the means whereb at a receivingstation successions of difilerent current impulses transmitted over aline maybe selectively indicated.

The accompanying drawing is an electrical diagram wherein the variousparts of the apparatus are conventionally and symbolically shown. 7

The sourceA of current which is grounded at G may be any source, and ishere represented by the conventional symbol of a dynamo. a a

We will first describe the principal de vices associated in the circuit.Magnet B controls through its armature two switch arms I), 12. Arm 1)opens and closes circuits at the contacts 1 and 2. Arm 6 opens andcloses circuit at the contact 3. Magnet B is normally energized by thesmall current on'the circuit, so that its armature is attracted, thusclosing circuit at l and breaking circuit. at 2 and 3.

Magnets D, D, E, E" control the trans lating mechanism at the central orhome station, Magnets D and E areto be made relatively weaker thanmagnets D and E. Hence, if two sets of impulses, one stronger than theother, he successively transmitted,

all of the magnets D, E, D, E will be capable of responding to thestronger set of impulses, but only E will res 0nd to the weaker set.Magnet D through ts pivoted switch lever opens and closes ciroult atcontact 4, and magnets D, E, E by similar means open and close circuitat contacts 5.

hence weaker.

' magnets D, E.

brushes m, m of transmitter T, Wire rotating its wheel 6,7. Magnets Dand D are normally ener ized.

agnet F is a neutral wound relay. When both of its coils are energized,it does not act. Through its armature it controls two switch arms f, f.The arm f opens and closes circuit at contact points 8, 9, and the, arm7 opens and closes circuit at contact points l0, l1.

At J is shown a polarized ma net, the pivoted arm j of which opens and coses circuit at contact point 12.

The transmitting mccham'sm.-Two transmit-ters T, T connected in seriesare here shown. Each comprises a code wheel M having on its shaft a camN having a rim of insulating material, against whlch rim bears a brush'n. which, at the contact point- 13, opens and closes circuit to groundG. When the wheel M is at rest, the bent over end of brush it enters anotch 0 in cam N Patented Aug. 9, 1910. k

and so opens circuit to ground. The brush transmitter T is bridged at 16by a connec i tion containing resistances 17, 18, which connection'isalso connected to ground at G. The impulses transmitted by transmitter'1 i will vary from zero to maximum strength of current. By reason ofthe bridged resistances, however, the impulses transmitted bytransmitter T will be of narrow range and The impulses from T willtherefore operate all four magnet-s D, D, E,E, While those from T willoperate only In this way two sets of signals may be transmitted to thehome or central station, and will therebe selected and cause to operate'diflerent translating or indicating means. h

The metallic circuit proceeds as follows: from dynamo A, by Wire 19 tomagnets D, D, wire 20, one coil of magnet F, Wire 21, 22, brushes m, mof transmitter T, by wire 23 to the other coil of F, switch arm f,contact 9, wire 24, switch arm I), contact 1, magnet 13, and by Wire 25back to dynamo. The wires 21, 23 may be the line conductor between thetransmitting and, receiving stations. Assume transmitter T to beoperated M by any suitable means. Magnets D, D, E, E willall respond andwill open and close their contacts 4, 5, 6, 7. These contacts and theswitch arms controlled by said ma nets are in local circuit with sourceK 0 current (here shown as a storage battery) and with glow lamps O, P,Q, R as the receiving station. If, on the other hand, transmitter T beoperated, the weaker current will affect only magnets D and E, and henceonl the lamps P and Q will translate the signa s.

WVhen an abnormal disturbance occurs in the electrical conditions on thecircuit, the operation is as follows: Assume a break to occur at thepoint X on wire 21. This deenergizes magnets B, D, D. Two leads thenproceed" from source A as follows: (1) from the non-grounded pole, bywire 19 to D, D, wire 20, one coil of F to the break at .X; (2) from thenon-grounded pole, by wire 19 to magnets E, E, by wire 26, junctionpoint W through the 'coils of polarized magnet J, junction Z, wire 27,contact point 2, switch arm 6, wire 24, contact 9, switch arm f, onecoil of magnet F, by wire 23 to transmitter T, and by wire 22 totransmitter T, the circuit being completed to grounds G, Gr when. closedby wheels M, M.

Assume a break to occur at the point Y on wire 23. Magnets B, D, D aredeenergized as before. Two leads then proceed from source A as follows:(1) from source A, by wire 19, to magnets D, D by wire 20, one

coil of'magnet F, by wire 21 to transmitters T, T and grounds G, G"; (2)from the nongrounded pole, by wire 19 to magnets E, E, by wire 26,junction point WV through the coils of polarized magnet J, junction Z,wire 27 contact point 2, switch arm 6, wire 24, contact 9, switch arm f,one coil of magnet F, by wire 23 to break at point Y.

In the case of an abnormal ground, the operation is as follows: Assumesaid ground tooccur at the point X on wire 21. Two leads then proceedfrom source A as follows: (1) by wire 19 through magnets D, D, by wire20 to one coil of magnet F, to abnormal ground at X. Magnet F beingenergized attracts its armature. (2) by wire 19 through magnets E, E toswitch arm f, contact 10, junction S, point 8, switch arm f, other coilof F, wire 23 and transmitters T, T to abnormal ground at X until thetransmitters are set in operation to close circuit to grounds G, GAssume said abnormal ground to occur at the point Y on wire 23. Twoleads then proceed from source A as follows: (1) by wire 19 throughmagnets D, D, by wire 20 to'one coil of magnet F, wire 21, transmittersT, T to abnormal ground at Y until the transmitters are set in operationto close circuit to grounds G, G Magnet F being energized attracts itsarmature. (2) by wire 19 through magnets E, E to switch arm f, contact10, unction S, point 8, switch arm f,

other coil of F, by wire 23 to abnormal ground at Y.

It will be obvious, (1) that under normal operation two leads are formedwhich terminate either at ground G or G or if both transmitters operatesimultaneously, at both grounds. W'hen the abnormal ground or breakoccurs then one of those leads becomes inoperative, while the otherconveys the signals: (2) that when the disturbance occurs on one side ofthe transmitters, as at X, the magnets E, E are brought into operation,while when it occurs on the other side, as at Y, the magnets 1),D areoperated. The magnets E, E are respectively in circuit with the localbattery K and the lamps Q, R. Hence when transmitted signals arereceived by magnets D, D, the same are translated by the lamps O, P, andwhen received by magnets E, E they are in like manner translated bylamps Q, R.

We will now describe the means for automatically restoring the metalliccircuit after the disturbance has been physically removed. We constructa shunt from the point W on wire 26 around to the grounded pole of thedynamo, the circuit proceeding from point W to switch arm f, contactpoint 11, wire 28, resistance 29, switch arm I), contact 3,

'and wire 25 to dynamo. Assuming the disturbanc'e to be a break, thisshunt provides a path for the current after the break has beenphysically repaired, the whole circuit then being from the non-groundedpole of the dynamo, through magnets D, D, one coil of F, wire 21,transmitters T, T, wire 23, other coil of F, switch arm 7, point 9, wire24, switch arm 5, point- 2, wire 27, to junction Z through polarizedmagnet J to junction W, switch arm f, point 11, wire 28, resistance 29,switch arm b, contact 3 and wire 25 to dynamo. The current in magnet Jis thus reversedbeing from Z to W in stead of from W to *Z. The switchlever 7 is thus swung to close contact at 12. Circuit then proceeds fromdynamo through E, E to W, to switch lever j, to resistance 30, to magnetB and so by wire 25 to grounded pole of dynamo. Magnet B then attractsits armature to close circuit at 1 and open circuit at 2 and 3, when theswitch arm j swings back and the normal metallic circuit as first tracedis reestablished.

The object of the resistance 29 is to insure suflicient current to thecoil of magnet F, which connected to the grounded pole of source A,after a break has occurred in wire 21. over the shunt from W around tothe grounded pole of dynamo A that a proper operation of said magnetmight not be obtained. The necessity of this operation of magnet F is toclose circuit at f and 10, and open same at 11. Opening circuit at 11prevents the current on the shunt from impair- Otherwise so much currentwould pass ing the operation of magnets E and E when actuated by thetransmitters.

. from (lemagnetizing said magnet.

The object of resistance 30 is to diminish the energizing currentthrough magnet B, so as-to prevent a magnetic lag sulficient to causethe armature to stick after the circuit is broken or grounded. In likemanner the magnet F is also to be so constructed as to keep the circuitclosed through the leads When the grounded transmitter or transmittersare operating. If,,for any-reason,.

the ground G or G is disoonnectedfthen the transmitters T, T make andbreak the metallic circuit, and in that Way operate the translatingmechanism. The interruptions are to. be made sufiiciently short so asnot to permit the magnet B to fail, or said magnet may be constructed inany suitable Way so as -to keep the metallic circuit closed.

We claim:

1. The combination of a source of current, a metallic circuit normallyenergized thereby, a transmitter, a translating device, means actuatedby an abnormal disturbance of electrical conditions on the circuit forautomatically neutralizing the effect of said disturbance upon theoperation of said translating device by said transmitter, and meansautomaticallyoperating on the removal of said disturbance to restore thenormal electrical conditions on said circuit.

2. The combination of a source of current, a metallic circuit normallyenergized thereby, a plurality of translating devices, means Closing circult at 10 short-circuits permanent magnet operated by an abnormaldisturbance of electrical conditions on the circuit for establishingcurrent leads respectively including saidtranslating devices, atransmitter operating through one of said leads to actuate thetranslating device therein, and means automatically operating on theremoval of said disturbance to disestablish said-leads and restore thenormal electrical conditions on said circuit.

3. The combination of a source of current, a metallic circuit normallyenergized thereby, .tWO sets of selective translat ng devices, meansoperated by an abnormal disturbance of electrical conditions on thecircuit for establishing current leads each including a set of saidtranslating devices, and transmitters respectively sending successionsof different current impulses operating through one of said leads toactuate the selective translating devices therein.

4. The combination of a source of current, a metallic circuit normallyenergized thereby, means for transmitting a plurality of successions ofdifierent current impulses, means for selectively translatingsaidsuccessions, and means actuated by an abnormal disturbance of electricalconditions on the circuit for automatically neutralizing the effect ofsald dlstnrbance upon the operation of said selective translating meansby said transmitting means.

In testimony whereof We have affixed our signatures in presence of twowitnesses. ALBERT GOLDSTEIN. CLARK H. POOL; Witnesses:

GERTRUDE T. PORTER, MAY T. MCGARRY.

